I read a helpful book on this subject recently: "Write to Market" by Chris Fox. It is not specific to the romance genre, but it IS pretty specific to Amazon, explaining their ranking system, how to research, etc. etc.
If you have a KU subscription, you can borrow it and read it for free.
https://www.amazon.com/Write-Market-Deliver-Faster-Smarter-ebook/dp/B01AX23B4Q
Here are a few things to examine:
1) Are you marketing the books? Do you have a reader magnet/free book? Do you do book promotions with other authors on Bookfunnel or Prolific Works to get subscribers for a newsletter? Do you have a newsletter that you use to market to an audience of subscribers? Do you do newsletter swaps with other authors in your genre? Do you schedule promotions? What is your book pricing? Have you tried releasing at 99 cents?
2) If you are doing all of number 1, have you had beta readers look at your books to give you feedback?
3) Are your books written to market? I suggest reading this book if you haven't already on how to research what sells. https://www.amazon.com/Write-Market-Deliver-Faster-Smarter-ebook/dp/B01AX23B4Q
As far as fiction, it may be that you need to write to market in order to make that kind of money. I recommend Chris Fox's book. https://www.amazon.com/Write-Market-Deliver-Faster-Smarter-ebook/dp/B01AX23B4Q
I'm not saying you can't do non-fiction and make money because you can. Here is a great article by Joanna Penn about which is more profitable. She has written both. https://www.thecreativepenn.com/2018/10/12/what-should-i-write-fiction-or-non-fiction/
Yes, you can definitely do it. There is traditional publishing but it can often take longer than the 5 years you mentioned. I started writing as a way to make money with no background in writing or any creative writing courses and I was able to do it full-time, making more than the job I left. But it takes a lot of research, practice, and feedback. Here are a few links to resources I have used to learn.
Start by reading this book. With making money, you need to know what kind of books are popular and Chris Fox explains how to study the market. You don't have to write to market, but if you are looking for a way to make money, this is how to start. You can still write the kind of books you want but go into knowing what you're getting into. https://www.amazon.com/Write-Market-Deliver-Faster-Smarter-ebook/dp/B01AX23B4Q
I started with this FB group where there are a lot of self-published authors making a lot of money. You can find the answer to most questions here. https://www.facebook.com/groups/20Booksto50k
I used this site with my first book and it helped me getting feedback, https://www.critiquecircle.com/landing
You can also find Beta Reader groups on FB.
This is a great resource even if you aren't a woman or don't write romance. This group helped me tremendously when I first started out. https://www.facebook.com/groups/170375933609063
Their YouTube, https://www.youtube.com/c/TheWritingGals
As far as marketing, this is essential for all self-published authors. Write a reader magnet (a free book) and join promotions to gain subscribers that you can add to a regular newsletter. Use the newsletter to share your launches, sales, etc and swap with other authors so share their books and they in turn share yours. https://bookfunnel.com/
Two others are Prolific Works and Story Origin App. Story Origin has a place where you can do newsletter swaps with other authors.
How to format a book for Kindle instructions, https://www.youtube.com/watch?v=iPqJHJDVVVs&t=137s
If you self-publish exclusively with Amazon, you can get page reads. I get 3/4 of my money from that. People purchase a monthly Kindle Unlimited subscription for $9.99 where they can borrow books for free with the subscription. If you enroll in the kindle unlimited program, you get paid for every page read. You can set up your books on this platform. https://kdp.amazon.com/en_US/
Amazon also has a program now called Vella, which is serialized fiction. You can read more about it here. https://kdp.amazon.com/en_US/help/topic/GR2L4AHPMQ44HNQ7
I hope that helps!
Can you think of any profession in which purposely avoiding the best in the field is a good idea?
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Studying other successes in your field is a very good way to improve.
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You might also want to read "Write To Market" by Chris Fox.
Chris Fox has a very good book on this.
https://www.amazon.com/Write-Market-Deliver-Faster-Smarter-ebook/dp/B01AX23B4Q
No. Get more traction in the writing field before you leave your job. Test the waters with three short (15-20k word) novellas until you find a sub-genre that works for you. Then write longer works and price appropriately. Make sure your covers and blurbs are top notch.
Additional resources: https://www.amazon.com/Write-Market-Deliver-Faster-Smarter-ebook/dp/B01AX23B4Q?ie=UTF8&ref_=asap_bc
http://selfpublishingroundtable.com/sprt-143-interview-with-prolific-author-amanda-m-lee/
Consider Dragon NaturallySpeaking (Dragon Dictate if you have a Mac) for increased output. I tripled my writing speed from 1,000 to 3,000 words per hour with it. http://www.tkqlhce.com/click-4970713-10586061-1439933017000